<template>
  <div class="alphabet" ref="alphabet_scroll">
   <div class="scroll_wrap">
      <!-- 热门城市 -->
       <div class="hot_wrap citylist">
            <div class="title">热门城市</div>
            <ul class="hot_city">
                <li @click="$emit('selectCity',item)" v-for="(item, index) in cityInfo.hotCities" :key="index">
                    {{item.name}}
                </li>
            </ul>
       </div>
      <!-- 所有城市 -->
       <div class="city_wrap">
          <!-- 遍历按字母的排序的key -->
          <div class="city_content citylist" v-for="(item, index) in keys" :key="index">
              <div class="title">{{item}}</div>
              <!-- 根据字母key来展示城市名称 -->
              <ul>
                  <li @click="$emit('selectCity',city)" v-for="(city, index) in cityInfo[item]" :key="index">
                      {{city.name}}
                  </li>
              </ul>
          </div>
       </div>
   </div>
   <div class="alphabet_keys">
       <ul>
           <li @click="selectkey(0)">#</li>
           <li v-for="(item, index) in keys" :key="index" @click="selectkey(index+1)">
               {{item}}
           </li>
       </ul>
   </div>
  </div>
</template>

<script>
import BScroll from "better-scroll"
export default {
    data() {
        return {
          scroll:null,
        }
    },
    methods: {
        initBScroll(){
            this.scroll =new BScroll(this.$refs.alphabet_scroll,{
                click:true,
            });
        },
        selectkey(index){
            const citylist=this.$refs.alphabet_scroll.getElementsByClassName('citylist'); 
            let el=citylist[index];
            this.scroll.scrollToElement(el,300);
        }
    },
    props:{
       cityInfo:Object,
       keys:Array,
   }
}

</script>
<style lang="scss" scoped>
.alphabet {
  margin-top: 10px;
  box-sizing: border-box;
  padding: $common-padding;
  background: $module-color;
  height: calc(100% - 65px);
  overflow: hidden;
  .scroll_wrap {
    background: #fff;
    overflow: auto;
    .title {
      color: #aaa;
      padding: 15px 0;
    }
    .hot_city {
      padding: 0 16px;
      display: flex;
      flex-direction: row;
      flex-wrap: wrap;
    li {
      width: 30%;
      background: #f1f1f1;
      margin: 0 10px 10px 0;
      text-align: center;
      padding: $common-padding;
      box-sizing: border-box;
    }
  }
  .city_wrap {
    .city_content {
      li {
        padding: 10px;
        border-bottom: 1px solid #eee;
      }
    }
  }
}
.alphabet_keys {
  position: fixed;
  right: 0;
  top: 25%;
  color: #aaa;
  font-size: 12px;
  line-height: 1.4;
  text-align: center;
  padding: 0 5px;
}
}
</style>